Authorities say a man charged in the deaths of a Manchester couple helped the couple's grandson by suggesting ways to kill them.

Brandon Ahlers, 19, of Manchester, was arrested Monday on two counts of aiding and abetting in first-degree murder in the deaths of Richard and Janet Sweet. They were found shot to death in their home on May 13.

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Their grandson, 17-year-old Isaiah Sweet, is charged as an adult with two counts of first-degree murder.

The Cedar Rapids Gazette newspaper says a criminal complaint says Ahlers told investigators he had several discussions with Isaiah Sweet about ways to kill his grandparents.

Ahlers was in Delaware County District Court on Tuesday. Online court records show the public defender's office is appointed to his case, but doesn't include an attorney's name.